Source: https://game.watch.impress.co.jp/doc...w/1176157.html
https://www.gamer.ne.jp/news/201903240006/

Q: When did you decide to implement the female-only Viera and male-only Hrothgar?

A: It was during Return to Ivalice, around 3 months after 4.0. Viera was confirmed then, and Hrothgar came about at the same time when we were discussing plans with Matsuno-san. We were deciding whether to make a Hrothgar female or a Viera female, and after selecting Viera, work began right away, because otherwise we wouldn't make it in time. As mentioned before, the face parts are special and Hrothgar has big differences between its faces, like a lion face, wolf face, leopard face. It became a fixed model relatively recently. Viera was done right before Paris Fan Fest, and Hrothgar was done recently.

Points to the inference that they were in a time/cost crunch when developing the races.

People freaking the hell out about the lack of counterparts, you can unclench your intestines now.